Damien Seguy has released the latest PHP statistics for last month - April 2008. Among the highlights are things like:

PHP 5.2.5 is now the most popular PHP version, ahead of 4.4.8

PHP 5 reaches 36.60% of PHP market share

Still a lot of migrations toward 5.2.5 and 4.4.8

You can check out the details on these and other statistics (like PHP usage by country and version) the complete monthly stats and the evolution stats. Oh, and don't forget - Damien and crew are the ones supplying the latest edition of the elePHPants to the PHP community!